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Method and system for engine control

An engine and operator technology that can be used in engine control, engine components, combustion engines, etc., to solve problems such as difficult to detect misfires at light loads

Pending Publication Date: 2021-02-09
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the light load and low IMEP of engine cylinders operating under DFSO may make it difficult to detect misfires

Method used

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  • Method and system for engine control
  • Method and system for engine control
  • Method and system for engine control

Examples

Experimental program
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Embodiment Construction

[0016] Systems and methods for fuel control for engine operation under DFSO are disclosed. exist figure 1 and figure 2 An exemplary engine system is shown at . According to one or more control programs (such as Figure 3 to Figure 5 method) to filter input from the vehicle operator during DFSO in order to limit low-load fuel injection and DFSO exit due to vehicle operator foot wobbling. exist Figure 6 to Figure 7 Exemplary DFSO entry and exit scenarios with filtered operator pedal input are shown at .

[0017] figure 1 Engine system 100 for vehicle 5 is depicted. Vehicle 5 may be an on-road vehicle having drive wheels contacting a road surface. Engine system 100 includes engine 10 including a plurality of cylinders. figure 1 One such cylinder or combustion chamber is described in detail. Various components of engine 10 may be controlled by electronic engine controller 12 .

[0018] Engine 10 includes combustion chamber 30 and cylinder walls 32 with piston 36 positi...

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Abstract

The invention provides a method and a system for engine control. Methods and systems are provided for protecting an exhaust catalyst from degradation during a DFSO event. Exit from DFSO due to pedal input received from an operator with a jittery foot is averted by filtering the pedal input differently when operating in a DFSO mode as compared to when operating out of the DFSO mode. Exit from DFSOis confirmed after receiving a higher than threshold pedal position input for a sustained period of time, or when an integrated fuel injection amount exceeds a threshold amount.

Description

technical field [0001] The present description generally relates to methods and systems for controlling a vehicle engine to protect exhaust catalysts during deceleration fuel cutoff (DFSO). Background technique [0002] During an engine operating mode commonly referred to as deceleration fuel cutoff (DFSO), fuel injection to one or more engine cylinders may be interrupted. DFSO mode is typically initiated when an engine-powered vehicle is decelerating, and the vehicle's engine output control element is positioned for engine idle (i.e., no operator demand for additional engine output (e.g., in response to operator tip-out of the accelerator pedal)) ( throttle or accelerator pedal). As a result of DFSO operation, fuel consumption is reduced and engine braking is provided by frictional drag and negative torque applied to the engine by the engine's load. When the engine rotational speed drops below a predetermined minimum speed near idle, or when an engine control element is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D41/02F02D41/12F02M37/32
CPCF02D41/0005F02D41/021F02D41/0295F02D41/123F02M37/32F02D2041/0012F02D2041/1412F02D2200/0804F02D2200/0814F02D2200/50F02D2200/602F02D13/0219F02D13/0265F02D2041/1432F02D41/126F02D2200/0802F02D2200/0406F02D2200/70F02D41/0245F01N2430/02F01N2430/06F01N2430/08F01N2900/1602F01N2900/1624Y02T10/12F01N11/005F02D2041/0265F02D41/0235F01N11/007
Inventor 克里斯·保罗·格鲁格拉加兰·J·休伯茨曲秋平
Owner FORD GLOBAL TECH LLC